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/*
* Copyright (C) 2007, Jason Kivlighn <jkivlighn@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/mman.h>
#include <glib.h>
#include <glib/gstdio.h>
#include <gio/gio.h>
#include <libtracker-common/tracker-file-utils.h>
#include <libtracker-extract/tracker-extract.h>
/* This function is used to find the URI for a file.xmp file. The point here is
* that the URI for file.xmp is not file:///file.xmp but instead for example
* file:///file.jpeg or file:///file.png. The reason is that file.xmp is a
* sidekick, and a sidekick doesn't describe itself, it describes another file. */
static gchar *
find_orig_uri (const gchar *xmp_filename)
{
GFile *file;
GFile *dir;
GFileEnumerator *iter;
GFileInfo *orig_info;
const gchar *filename_a;
gchar *found_file = NULL;
file = g_file_new_for_path (xmp_filename);
dir = g_file_get_parent (file);
orig_info = g_file_query_info (file, G_FILE_ATTRIBUTE_STANDARD_NAME,
G_FILE_QUERY_INFO_NONE,
NULL, NULL);
filename_a = g_file_info_get_name (orig_info);
iter = g_file_enumerate_children (dir, G_FILE_ATTRIBUTE_STANDARD_NAME,
G_FILE_QUERY_INFO_NONE,
NULL, NULL);
if (iter) {
GFileInfo *info;
while ((info = g_file_enumerator_next_file (iter, NULL, NULL)) && !found_file) {
const gchar *filename_b;
const gchar *ext_a, *ext_b;
gchar *casefold_a, *casefold_b;
/* OK, important:
* 1. Files can't be the same.
* 2. File names (without extension) must match
* 3. Something else? */
filename_b = g_file_info_get_name (info);
ext_a = g_utf8_strrchr (filename_a, -1, '.');
ext_b = g_utf8_strrchr (filename_b, -1, '.');
/* Look for extension */
if (!ext_a || !ext_b) {
g_object_unref (info);
continue;
}
/* Name part is the same length */
if ((ext_a - filename_a) != (ext_b - filename_b)) {
g_object_unref (info);
continue;
}
/* Check extensions are not the same (i.e. same len and ext) */
if (g_strcmp0 (ext_a, ext_b) == 0) {
g_object_unref (info);
continue;
}
/* Don't compare the ".xmp" with ".jpeg" and don't match the same file */
/* Now compare name (without ext) and make
* sure they are the same in a caseless
* compare. */
casefold_a = g_utf8_casefold (filename_a, (ext_a - filename_a));
casefold_b = g_utf8_casefold (filename_b, (ext_b - filename_b));
if (g_strcmp0 (casefold_a, casefold_b) == 0) {
GFile *found;
found = g_file_get_child (dir, filename_b);
found_file = g_file_get_uri (found);
g_object_unref (found);
}
g_free (casefold_a);
g_free (casefold_b);
g_object_unref (info);
}
g_object_unref (iter);
}
g_object_unref (orig_info);
g_object_unref (file);
g_object_unref (dir);
return found_file;
}
G_MODULE_EXPORT gboolean
tracker_extract_get_metadata (TrackerExtractInfo *info)
{
TrackerResource *resource;
TrackerXmpData *xd = NULL;
gchar *filename, *uri;
gchar *contents;
gsize length = 0;
GFile *file;
int fd;
struct stat st;
file = tracker_extract_info_get_file (info);
filename = g_file_get_path (file);
fd = tracker_file_open_fd (filename);
if (fd == -1) {
g_warning ("Could not open xmp file '%s': %s\n",
filename,
g_strerror (errno));
g_free (filename);
return FALSE;
}
if (fstat (fd, &st) == -1) {
g_warning ("Could not fstat xmp file '%s': %s\n",
filename,
g_strerror (errno));
close (fd);
g_free (filename);
return FALSE;
}
if (st.st_size == 0) {
contents = NULL;
length = 0;
} else {
contents = (gchar *) mmap (NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (contents == NULL) {
g_warning ("Could not mmap xmp file '%s': %s\n",
filename,
g_strerror (errno));
close (fd);
g_free (filename);
return FALSE;
}
length = st.st_size;
}
uri = g_file_get_uri (file);
if (contents) {
gchar *original_uri;
original_uri = find_orig_uri (filename);
/* If no orig file is found for the sidekick, we use the sidekick to
* describe itself instead, falling back to uri
*/
xd = tracker_xmp_new (contents,
length,
original_uri ? original_uri : uri);
if (xd) {
resource = tracker_resource_new (NULL);
tracker_xmp_apply_to_resource (resource, xd);
tracker_extract_info_set_resource (info, resource);
g_object_unref (resource);
}
g_free (original_uri);
tracker_xmp_free (xd);
g_free (filename);
g_free (uri);
munmap (contents, length);
close (fd);
return TRUE;
}
close (fd);
g_free (filename);
g_free (uri);
return FALSE;
}
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